Search results
Results From The WOW.Com Content Network
The higher gas density also causes gas mixing within the lung to be less efficient, effectively increasing the physiological dead space. [41] The work of breathing can reach a point where all available energy must be expended on breathing. Beyond this point carbon dioxide cannot be eliminated as fast as it is produced. [16]
Helium may be added to reduce the amount of nitrogen and oxygen in the gas mixture when diving deeper, to reduce the effects of narcosis and to avoid the risk of oxygen toxicity. This is complicated at depths beyond about 150 metres (500 ft), because a helium–oxygen mixture then causes high pressure nervous syndrome. [1]
This can be caused by breathing air at a pressure above normal or by breathing other gas mixtures with a high oxygen fraction, high ambient pressure or both. The body is tolerant of some deviation from normal inspired oxygen partial pressure, but a sufficiently elevated level of hyperoxia can lead to oxygen toxicity over time, with the ...
Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen (O 2) at increased partial pressures.Severe cases can result in cell damage and death, with effects most often seen in the central nervous system, lungs, and eyes.
What’s more, Ruff found that the quantity of oxygen produced was enough to sustain other oxygen-dependent microbial life in the groundwater. “Nature keeps surprising us,” he said.
The combined concentrations of gases in any given tissue will depend on the history of pressure and gas composition. Under equilibrium conditions, the total concentration of dissolved gases will be less than the ambient pressure, as oxygen is metabolised in the tissues, and the carbon dioxide produced is much more soluble.
Natural gas is mostly methane and it's produced deep underground by the same processes that create oil and coal. Horizontal drilling has allowed wells to tap hard-to-reach layers known as shale.
Since bumping up against support at 2.75 in mid-September, liquified natural gas price have jumped 18 percent, hitting a high above $3.20 for the first time since February. Prompting this is news ...